Experimental Investigation of Flow Resistance in a Coal Mine Ventilation Air Methane Preheated Catalytic Oxidation Reactor

Bin Zheng,Yongqi Liu,Jian Meng,Mingming Mao,Ruixiang Liu

doi:10.1155/2015/375789

Bin Zheng, Yongqi Liu + Show 3 more

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https://doi.org/10.1155/2015/375789

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Abstract

This paper reports the results of experimental investigation of flow resistance in a coal mine ventilation air methane preheated catalytic oxidation reactor. The experimental system was installed at the Energy Research Institute of Shandong University of Technology. The system has been used to investigate the effects of flow rate (200 Nm3/h to 1000 Nm3/h) and catalytic oxidation bed average temperature (20°C to 560°C) within the preheated catalytic oxidation reactor. The pressure drop and resistance proportion of catalytic oxidation bed, the heat exchanger preheating section, and the heat exchanger flue gas section were measured. In addition, based on a large number of experimental data, the empirical equations of flow resistance are obtained by the least square method. It can also be used in deriving much needed data for preheated catalytic oxidation designs when employed in industry.

Highlights

Coal mine methane emissions make up approximately 8% of the world’s anthropogenic methane emissions, and the quantity of methane emissions from coal mining alone is over 25 million tons every year
The pressure drops of the preheating section and the flue gas section in the heat exchanger increase quadratically, but the pressure drop of the catalytic oxidation bed increases linearly
According to Darcy’s law, the pressure drops of the preheating section and the flue gas section increase quadratically because the Reynolds number in the heat exchanger is between 17773 and 88640, which is far higher than the critical Reynolds number (2320), but the pressure drop of catalytic oxidation bed increases linearly because the Reynolds number in the catalytic oxidation bed is between 398 and 1987, which is under critical Reynolds number (2320)

Summary

Introduction

Coal mine methane emissions make up approximately 8% of the world’s anthropogenic methane emissions, and the quantity of methane emissions from coal mining alone is over 25 million tons every year. Zheng et al [18] investigated a preheated catalytic oxidation reactor to combustion coal mine ventilation air methane. This reactor employs a new working principle and different CFRRs and TFRRs, which is not reverse-flow. The objective of the present study is to investigate the effects of key operational parameters on flow resistance processes within the preheated catalytic reactor. It can be used in deriving much needed data for preheated catalytic oxidation designs when employed in industry

Operating Principle

Experimental Reactor System

Results and Discussions

Experimental results Calculated results

Conclusions